Telephone system



J. I. BELLAMY TELEPHONE SYSTEM May 14, 1929.

Original Filed Oct. 50, 1924 5 Shasta-Sheet 1 Imrsu car-- Juhn LBEZZamy May 14, 1929. J. l. BELLAMY 1,712,643

TELEPHONE SYSTEM I Original Filed Oct. 30, 1924 5 Sheets-Sheet 2 IZZU'ELLLIUPK Jmhn 152115111 May 14, 1929. J. l. BELLAMY 1,712,643

7 TELEPHONE SYSTEM Original Filed Oct. 30, 1924 5 Sheets-Sheet 5 3% 5w www x %%N www mww dlril v EM 4% aww RE wwm 2 -ImrenZun-- Juhn I. Bellamy J. l. BELLAMY TELEPHONE SYSTEM Original Filed 001:. 30, 1924 5 Sheets-Sheet 4 May 14, 1929.

him-- John I. Bellamy May 14, 1929. J. 1. BELLAMY TELEPHONE SYSTEM 5 Sheets-Sheet 5 Original Filed Oct. 30, 1924 --Inusn1m- John IBEZZam pie switchhoolespring combination.

Patented May 14, 1929.

entree stares PATENT orFrcE.

JOHN I. BELIiAMY, on BROOKFIELD, ILLINOIS; Assienolt, BY MESNE ASSIGNMENTS,

To AUTOMATICEIEECTBIC INC, on CHICAGO; IIiL'moIs; A CORPORATION or DELA- WARE.

TELEPHONE SYSTEM;

Application filedOeto'ber 30, 1924, Serial No. 749,730. 'Renewed fietob er 15, 1928;

Tthc present invention relates to telephone systems in general, but is concerned more particularly with automatic tOlGPl'lOl'lQSYS- tomsand the broad 'eneral ob'ect is the a b production of a new and mproved telephone system in which the apparatus employed is ing device with a pair of impulse contacts and three shunt sprin s, and having a'sim- Another object the productionotanew and improvedcircuit arrangement whereby the line relayof a rotary lineswitcl'i individual. to a calling subscriber s lineiseinpioyed on y calls originated on the associated line to connect up the wipers otthe" line switch and to maintain them connected throughout theconnection so asto obviate the necessity of the usual mechanical interlocle ing device which i is otherwise enlployed to prevent the combined cut-oft andswitching relay from pullingtall'the way up aiid-conne'cting the associated line to the switch wipers on inconiingcalls;

Another object is the production of novel nit arrangemer"s whereby the calling suhserihei"s meter is controlledover the r lease trunk conductorhy an eleetro-polarized .ayasseciated with afirst'se'lector, as will hereinafter appear.

itnother object is eoncerned with thepro duction' of, a new andimproved circuit'an rangrement 'lo'r controlling the slow-actingrhzingeover relay ofa switch in such aunannet that the relay falls back 111 the same time at the end. of a series'otnnpulses 111 all cases, irrespective of the length of the indirid ual impulse constitutin'githeseries.

it still further object has to'do' with'socalled directors which are ein-ployed'primarily in order to enable a: more econon'iicalx inter-oiiice trunking layout to be used 111a" quired to trunk the call to the desired otiice) which is common-to a plurality of directors instead of being individual to one director. Another objectis the production of a'new and improved counting relay circuit for operating nonn'iarginal counting relays, in which a minimum of relays are employed There are'a number of other objects and features of the invention which, however, are more or less incidental tothe carrying out of the objects set forth above. These latter objects and teat-ures,'together with the foregoing, will become apparent upon a further perusal of the specification.

Referring-now to the accompanying drawings comprising Figs. 1 5, inclusive, they show by means ofthe usual circuitdiagrams, a suflicient amount of apparatus in a telephone system embodying theprinciplesof the invention to enable the invention to be understood. Fig. 1'} shows the apparatus necessary to'extend a connection from a callinc; line to a first selectorand'alto a director selector DS for associating an idle director with the connection until it-is completed, and Figs. 25, inclusive, show one of the directors accessible to thedirector selector shownin Fig; 1i

Specifically, Fig. 1 shows the substatioirA andthe' associated line which terminates at the exchange in the line switchLS a ndalso in' the bank of connector switches (not shown). This drawing showsalso the selector S accessilileto the line switch LSand likewise the trunk circuit TC which is insertedin thetrunkhetweeit the banks of the line switch LS and the selector S andwhich euit closing and queuing" spring contacts requi l the substatiorrhasbeen greatly s11uplitied and improved, as" will hereinafter appear.

Theline' switch LS individual tothe line of si-ihstatieu is mechanically at the well p the line switch is novel in that the line relay known rotary type in which the wipers have no normal position, but areadvanced in a forward direction only, being advanced upon the backward stroke of the associated stepping magnet rather than upon the forward stroke; but from a circuit standpoint,

16constitutes means whereby the wipers are connected up on outgoing calls only, thereby permitting the usual mechanical interlocking device between the armatures of the two relays of the line switch to be omitted.

The selector S, mechanically, is of the.

well known vertical and rotary type of switch having bank contacts which are arranged in horizontal rows or levels, but 1 from av circuit standpoint contains a certain novel feature which will be pointed out hereinafter.

The director selector' DS is similar me-- chanically-to the line switch LS, and is connected up to the trunk circuit TC in such a manner that it operates to select an idle director when the associated trunk is seized, the trunk circuit TO being novel only in that it contains arrangements for permitting the calling subscriber to hear the im- 'are advanced step by step by the stepping magnet 105 and which are subsequently restored to' normal under the control of release magnet 106' which is provided with the off normal contacts'l07 to open its circuit when the normal position is reached, and is provided with the relays 101 and 102 through the medium of which it is advanced one step at the end of each series of impulses transmitted to the director from the trunk circuit TC.

The office register OR, Fig.4, is mechani V cally of the well known vertical and rotary type of switch, having its bank contacts arranged lnhorizontal rows. or levels, and

it responds to the first two digits dialled by the calling subscriber and positions its;

wipers uponthe set of bank contacts corresponding to the called ofiice, preparatory to the transmission of such digits as are necessary to trunk the call from the originating ofiice to-the called oflice.

Each of the digit registers DR1DR{1, inclusive, Fig( 5, is, from a mechanical standpoint, similar to the sequence switch S, Fig. 2, and each is operated to register one of the subscriber digits of a number following the registration of the oflice digits of-the number by .the office register OR, Fig. 4. i

The sequence switch S, Fig. 2, is, from a mechanical standpoint, a rotary switch of the well known type in which the wipers are advanced in a forward direction only and are advanced upon the backward stroke of the stepping magnet rather than upon the forward stroke, and is used to control,

successively, the transmission of the various digits of the number in their proper sequence.

The counting relays 403 and 411-420, inclusive, operate in conjunction with certain of the relays shown in Fig. 3 to control the transmission of the impulses constituting the digits and to terminate such transmission at the proper time, as will be hereinafter explained.

Referring now particularly to the intermediate distributing frame IDF, Fig. 4-, andthe associated apparatus, this intermediate distributing frame is provided for the purpose of enabling the oilice codes to be changed readily at .any time. In accordance with this, the intermediate distributing frame shown in the drawings has been made common to a }i)lurality of directors instead of being individual to one director, as is usually the case, for the sake of economy, and also so that the changing of the jumpers at one point affects all di' rectors to which the intermediate distributing frame is common.

Another and very important advantage gained by making the intermediate distributing frame common to a plurality ofdirectors is that the ofiice registers may be mounted side by side with their banks multipled together as in the case of ordinary automatic switches.

In order to enable the distributing frame to be'made common to a plurality of directors, a common counting switch CS has been provided. This counting switch is operated under the control of an interrupter 304 which is driven at the same speed and in synchronism with the various associated interrupters, one for each director to which the distributing fral'nc is common. The counting switch CS has. in addition to the ten impulse conductors 311-3520. inclusive, :1 common pick-up conductor 303 which extends to each of the associated directors and which controls the time of the starting of the transmission of impulses by the directors.

The apparatus having been described more or less in general, a detailed description of its operation will now be given. For this purpose, it will be assumed that the subscriber at substation A, desiring to make a call, removes his receiver.

When the receiver is removed at substation A, the switchhook 7 rises and closes a direct current bridge across the line conductors 11 and 12 which includes the impulse springs 5 of the calling device, the transmitter 6, and the upper winding of the induction coil all Then this occurs, line relay 16 of the line switch LS energizes and connects up the wipers 28-31, inclusive, at the armatures 23, 24, 26, and 27, and at amine ture E25 closes a circuit for switching relay and stepping magnet 14 in series, at the same time placing ground on the private normal conductor 13 so as to make the calling line busy in the banks of the connector switches having; access to it.

It will be noted that test wiper 29 is now connected to the j unctionof switching relay l5 and stepping magnet lt through the working contact and armature 2a, and armature 20 and its resting contact; and that test wiper b0 is connected, through the working contact and armature 26, and armature 21 and its resting contact, also to the junction oi. switching relay 15 and stepping); inan'net i l. Accordingly, the junction of switching relay 15 and stepping magnet 14; is grounded in case there is a ground potential applied to the conductor upon which test wiper 29 is standing or to the conductor upon which test wiper 80 is standing (the utility oi the provision of two test wipers will become apparent upon a fin-theiperusal oi} the Sl'JQQlilCttijlOll).

lltGln this point on, the operation depends upon whether the trunk terminating inythe bank contacts upon which the wipers oi the line switch are standing is busy or idle. If it is idle, there is no ground poten tial upon the bank contacts engaged by test wipers 29 and 30 and switching relay 1?) energizes, seizing the trunk. On the other hand, in case the trunk is busy, switching relay 15 is shortcircuited by the ground potential encountered upon the busy test contact by test wiper 29 or bytest wiper 30 and does not energize, and the wipers are advanced step by step by the buzzer-iii action of St(31)} 3i11g magnet 1-1, which operates through either of the test wipers 29 and 30, This operation continues until an idle trunk is reached, which trunk, it may be assumed,

is the one con'iprising conductors 36-38, inclusive, and extending to the trunk circuit TC. hen this idle trunk is reached, no ground is encountered by either of the test wipers 29 and 30, and switching relay 15, being; no longer short circuited, energizes in series with stepping magnet 14-. Stepping llllLfJIlQil 14L does not energize at this time on account of the high resistance of switching relay 15. Upon energizing, relay 15 disconnects test wiper from the junction of its own winding and that of stepping magnet 14; at armature 21, at the same time connrcting test wiper 30 to ground so as to make the seized trunk busy by way of the local test conductor 34 which, together with EHClUCtDl'S 32, 33, and 35, is inultipled to the bank contacts ofall the line switches having access to this trunk. As ail-further result of (illlftid' hi oi" the selector 0 the eiiergrization oi switching, relay 15, the line conductors 11 and 153 are disconncciml from-line relay l6 and ground, respectively, at arniatures 1.8 and E22 and are connec to the line conductors 36 trunk through arniatures and 5.2-? and wipers 28 and 31. its a still further result of the ergization of switching relay 15,3t discoi'i. .eci's test wiper ,9 ii'i'oni the llllCtiUi oi its own winding and that oi? stepping magnet i l and connects it instead to line relay l6, and at armature ll) connects the test wiper 29 to the marginally adjusted meter lln'l l iine relay it; is now disconitiectcd and no current is flowing through it, but it remains energized during; this interval owing to the fact that it is slow acting.

in the trunk circuit TC, line relay 41 now cncrgf'aes over the calling line and orer condui rs 36 and 88 and closes at armature a circuit for release relay which thereupon ei'iergizcs and places ground upon coni at aru'iature 46, thercoy closing: a circuit through the rcsis ance 83 holding conductor 3?, test wiper i oi. the l switch 11%, working; contact and aruuiturc and armature Eli and wort:-

contact for line relay l6 oi? the line switch ill S before it has had time to deeuergize. The meter M, whose magnet 17 now connected in multiple with line relay l6 throughthe working eonta ct and armature 19 of switching relay 15, is not operated at this time owing to its marginal. adjustment and owing to the relatively l'ligh resistance ill; in the selector S.

As a further result of the energizetitre 01" release relay 4:52, oi the trunk circuit "llC, it closes at armature do a circuit for switching; relay and soeppinc magnet 53 ot the director selector l lra in series, and, at armature 41%;; connects test wiper G0 to the junction oi relay and magnet 53. Accordinpiy, the director selector i355 selects an idle director in much the same manner as above described for the line switch l iti, whicn director, it will be assumed, is the one reached by way of conductors {52455,

inclusive. hen the selection oil? this direc tor occurs, switching relay 523 is no longer short circuited and energizes in series with ste 'ipino magnet 53, which nlagrnct does not energize at this time on account of the hio'h resistance oi switching relay 52; opens the test circuit and ,trrounds cmiductor (i-l; at armature 5b and through. wiper (30; connects up the operatinf j circuit at armature 5'? and through wiper ($1 to condiuztor 65 oi' the director; and it arniatures and 55 connects the line coruluctors oi? the selector S to wipers 58 and 59 which are now standine' upon the bani; coi'itacts in which the outgoing impulse conductors (32 and (53 oil the director to ninate. are normally closed tops x3e conductors i, ,roiigh armaand 38 of the seized tures 230 and 232 of relays 204 and 205, Fig. 3. Accordingly, line relay 72 of the selector S now energizes and closes at armature 87 a circuit'for release relay 73. When this occurs, relay73 energizes and prepares the selector for operation by operating armature 88.

In the seized director, holding relay 203 energizes responsive to the ground potential being placed upon the release trunk conductor 6 1 by the director selector DS as above pointed out, and at armatures 22"- and 229 opens the two release circuits of the director, while, at'arn'iature 228, it places ground upon the locking conductor 242 through armature 238 and its resting contact, for a purpose which will be made plain later.

The above operations have all taken place responsive to the removal of the receiver at the calling substation A, Fig. 1, and the apparatus is now in position for the first digit of'the number to be dialled.

When the calling subscriber rotates the well known finger hold dial of his calling device forward in accordance with the first digit in the desired number, the so-called shunt springs 9 come together and short circuit the transmitter 6 and the-receiver 8, so as to eliminate the resistance of the transmitter 6 from the line circuit during dialling and so'as to prevent the production of disagreeable clicks in the receiver 8. As the finger hold of the calling device rotates back to normal, the interrupter contacts 5 are separated a number of timescorresponding to the position to which it was moved upon the forward rotation. Each time the circuit is interrupted at the contacts 5, line relay 41 of the trunk circuit TC- deenergizes, and at armature 41-5 places ground on conductor 65 of the director through armature 57 and its working contact and wiper (31. Each time ground is olaced 11)OI1 conductor 65 an im 311180 of current is delivered through 'series relay 101, wiper 109 of the sequence switch S and 'conductor111 to the vertical magnet 825 Accordingly, the vertical magnet 325 is operated a number of times corresponding to the first digit dialled, and by the operation of vertical magnet325 the wipers 321432 1, inclusive, are raised step by step nntil they stand opposit-e the desired level of bank contacts. Relay 101 is energized in series with vertical magnet 325 and, being slow acting,

V maintains its armature 103 attracted throughout the vertical movement. At armature 103, relay 101 closes acircuit for the asso'iated slow acting relay 102, which energizes and preparesa circuit for the step ping magnet 105 of the sequence switch S V at armature 104.

At the end of the vertical movement, se-

ries relay 101 deenergizes and completes at armature 103 a circuit for stepping magnet 105 which is opened a moment later upon the deenergization of the slow acting relay 102. Responsive to the momentary closure of its circuit, stepping magnet 105 energizes and advances the wipers 108 and 109 one step, thereby shifting the operating circuit from the vertical magnet conductor 111 to the rotary magnet conductor 112 leading to the ofiice register OR.

hen the calling subscriber manipulates his calling device in accordaiu'e with the second digit in the desired number, conductor is grounded a number of times corresponding to the digit dialled and, each time it is grounded a circuit is closed through series relay 101, wiper 109, and overconductor 112 for rotary ma net 326 of the oflice register OR. Accordingly, the wipers 321-32 1, inclusive, are rotated step by step by the action of rotary magnet 320 nntilthcy come into engagement with the desired of bank contact-s, which set, it will be assumed, is the one comprising contacts 331-334, inclusive.

The sequence switch S is new advanced one step in the hereinbefore described manner, and wiper 109 shifts the operating circuit over to conductor 121 associated with the first digit register DR1, Fig. 5. At the same time, wiper 10S connects the common pick-up conductor 303v with the individual pick-up conductor 119 upon coming into engagement with its third bank contact. The description of the eil'ect of this operation, however, will be deferred until the description of the registration of the desired. number is completed.

hen the calling subscriber nninipulates his calling device in accordance with the first subscriber digit in the desired number, the resulting series of impulses is transmitted over the operating conductor 05 through series relay 101, wiper 109 of the sequence switch S, and over conductor 121 to the stepping magnet of the digit register DR-1 which responds to these impulses and sets the associated wiper upon the corresponding bank contact.

In the same way the digit register l )lt2 responds to the second subscriber digit; the. digit register DR-3 responds to the third subscriber digit; and the digit register DR-4 responds to the fourth subscriber digit, at the end of which the wipers 108 and 109 of the sequence switch advance. one step in the usual manner, as it does at the end of each digit, and the wipers come to rest and do not again move until the director is freed.

The utility of connecting the common pick-up conductor 303 to the individual pick-up conductor 119 at wiper 108 of the sequence switch S is to start the sending apparatus of the director to transmit the first code diqit necessary to trunk the call to the desired ollice. This may well be done at this time, since, as above pointed out, the two piclcup conductors are joined just suhsequent to the registration of the second. and last oflice digit.

It will be noted that the intcrrupters 304% 303, inclusive are all operated in synchronisni with each other and that they are all alike with the exception of the interrupter 301?. which controls the counting switch CS.

The conducting portion of the interrupterv an comes under tl' e associated brusha little sooner than the conducting; portions of the other interii'upters come under their asso ciated brushes. The insulated segments: of all the interrupters, however, come under their brushes at the same time. The reason tor this dili' 'erence will be brought outlater. ll may be seen that the stepping magnet 309 of the counting switch CS is alternately energized and deenergized under the control of the interrupter 30 1-, being deenergized while the insulating portion of the interrupter is under the brush, and being energized while the conducting portion of the interrupter is under the associated brush, It may be seen further that the wiper 310 is advanced step by step under the control of magnet 309 and that the wiper 310 is advanced upon the back stroke of stepping magnet 309 andv cone scquently is advanced upon the opening of the interrupter 30 t rather than upon its closing It may be seen further that the wiper 310 is grounded and extends ground to the bank contact upon which it is stand in only while themagnet 309 is deenergized between steps, and that ground is removed from the wiper 310. as soon magnet 309 energizes-3 for the next step which it does just a little ahead of the closure of the interrupters 305 to 308, inclusive, for a purpose to be explained more fully later.

To continue with the detailed description of the operation in setting up the connection now under discussion, as soon, after the conunon conductor 303 is connected with the 1056 oil: the sequence switch 5, individual pick-up conductor 119, armature 222 and its resting contact, resting contact and .arina ture 22d, and the normally closed contacts controlled by armature 235 for the pick-up relay 205. When this circuit is closed, pickup relay 205 energizes andv locks itself to onductor 242 at :u'mature at the same time opening its initial circuit, conductor 22-being grounded atthis time through the resting contact and armature 23S and armature 228 audit-s worhingcontact. As a further result of the energization of pick-up relay 205, it connects ground-to the upper terminal of the impulse relay 204st armature 234 through a ,circuit which includes armature 239 and its resting contact, and the resting-contacts and arn'1ature237. It will be appreciated that this occurs at a time when all the interrupters 304l-3OS, in- ':lusive,.are opened. Accordingly, the sending relay 1 does not immediately energize. a still turther result of the energiza tion of pick-up relay 205, Fig. 3, it removes the shunt from around armature 230 and its restingcontact of the sending relay 20-1 at armature 232, thereby placing the bridge across the outgoing control conductors 62 and 63 under the control of the sending relay 204;, and at armature 233 places ground upon conductor 116 through armature 236 and its resting contact, thereby closing a circuit for stepping magnet 113 of thesendingcontrol sequence switch S. Accordingly, stepping magnet 113 energizes preparatory to advancing thewipers 114 and 115.

As the interrupters 304-308, inclusive, advance still further, the interrupter closes first and closes a circuitfor stopping magnet 309 of thecounting switchIlS which accordingly energizes and removes ground lroin conductor 303 at armature 329, therehy pl'tfv'elltlllg any further pick-up relays in the other directors from energizing at this time and until the wiper 310 comes around with the pick-up position again. A little later, the interrupter-s 305-308, inclusive, .e simultaneously and, upon the closure of interrupter 305, a circuit is closed over conductor 110 for relay 204., Fig. 3, whose upper terminal was previously grounded at armature 234% by pickup relay 205. When "this occurs, impulse relav 20 1 energizes and opens the bridge across conductors 62 and 63 at armature 230. l ollowing this interruptirni ot the outgoing control circuit by relay 204-, the interrupters all. open at the same time, whereupon the impulse rcla 20-l (.leenergizes and again closes the outgoing control circuit and stepping magnet 309 oil the counting dceneraizes andadvanccs wiper switch Cl:

310 into engagement with the first stop conductor;3fl1, at the same time placing ground on the said stop conductor 311 at contacts 329. It may be well to point out that the contacts 329 do not close until after the wiper 310 has been advanced out of engagement with the bank contact in which the common pick-up conductor303 terminates and the pick-up conductor 303 is not again grounded at this time. Since the first code digit to be transmitted not the digit 1. but is, instead, the digit 0. the placing; of ground upon the first impulse stop conductor 311 does not produce any results as regards the director shown at this time, and the operation of the counting switch CS continues and the outgoing control circuit continues to be inter rupted by the impulse relay 204, Fig. 3, in the manner described above until wiper 310 arrives upon thebank contact in which the tenth impulse stop conductor 320 terminates,

at whichtime ten interruptions have been producedin the outgoing control circuit,

whereupon stop relay 207, Fig. 3, energizes over the following circuit: from ground by wav of the contacts 329 of the counting switch CS, Fig. 4, wiper 310, the tenth impulse stop conductor 320, jumper 335, the first bank contact 331 in the set of bank contacts belonging to the called ofiice, wiper 321, the first code digit stop conductor 131, first contactin the bank of wiper 115 of the sequence switch S and said wiper, conductor 120, armature 223 and its resting contact, the marginally adjusted skip relay 202, working contact and armature 243, and sto relay 207 to battery. \Vhen this circuit is closed, the marginal skip relay 202 does not energize, but stop relay 207 which may be considered somewhat in the capacity of an auxiliary stop relay, energizes and disconnects ground from the upper terminal of relay 204 and closes acircuit for stop relay 206 at armature 239. Stop relay 206 now energizes; opens a further point in the circuit of relay 204 at armature 237 opens the circuit of stepping magnet 113 of the sequence switch S and closes a locking circuit for itself at armature 236; and at armature 238 removes ground from the conductor 242, thereby opening the locking circuit of pickup relay 205. Pick-up relay 205, however, is slow acting and does not deenergize for the time being. As a result of the opening of the circuit of stepping magnet 113 of the sequence switch S by stop relay 206, stepping magnet 113 deenergizes and advances the wipers 114 and 115 one step and wiper 115 comes into engagement with the bank contact in which the second code digit stop conductor 132 terminates, preparatory to the subsequent termination of the second code digit.

In the selector S, line relay 72 deenergizes responsive to each of the above interruptions in the outgoingcontrol circuit of the director at armature 230 of relay 204, Fig. 3, and,

upon each deenergization, closes at armature 87a circuit for vertical magnet 81 through armature 88 and its working contact. By the operation of vertical magnet 81, the wipers 96-98, inclusive, of the selector are raised step by step and come to rest' opposite the desired'level of bank contacts. Relay 74 is energized in multiple with vertical magnet 81 through the contacts 82 of vertical magnet 81 upon each impulse of current being t 'ansmitted to vertical magnet 81.

The contacts 82 are adjusted to open just at the completion of the stroke of vertical magnet 81, thereby insuring that all impulses of current transmitted to the slow acting relay 74 are of the same length and this length cannot be longer than the time required for vertical magnet 81 to energize after its circuit is closed, and if the impulse delivered by armature 87 of line relay 72 on its back stroke is not of this length, the vertical magnet fails which means that, upon any impulse being transmitted to vertical magnet 81 which is of sufiicient length to operate the said v'ertical magnet 81, relay 74 receives an impulse of current of an unvanyin; length except, of course, for the variation in the length of time required for vertical magnet 81 to operate from time to time. Relay 74, being slow acting, maintains its armature 89 attracted throughout the vertical movement, and, upon the closure of oil normal contacts 81, which occurs at the end of the first vertical step, a circuit is closed through the interrupter contacts for the stepping relay 75. Upon energizing, relay 75 closes a locking circuit for itself at armature 90 and at armature 91 prepares a circuit for rotary magnet 79.

At the end of the vertical increment, the slow acting relay 74 deenergizes and closes at armature 89 a circuit through armature 91 and its working contact for rotary magnet 79 which energizes and advances the. wipers 96-98, inclusive, into engagement with the first set of bank contacts in the selected level, and, near the end of its stroke, opens the circuit of stepping relay '75 at the interrupter contacts 80. When this occurs, stepping relay 75 deenergizes and opens the circuit of rotary magnet 79 at armature 91, whereupon rotary magnet 79 decnergizes also and again closes its interrupter contacts 80.

From this point on, the operation depends upon whether the trunk terminating in the first set of bank contacts is busy or idle. If it is idle, switching relay 70 energizes, seizing the trunk. On the other hand, if the trunk is busy, switching relay 7G is short circuited by the ground potential encountered upon the busy test contact by test wiper 97 and does not energize. Also, stepping relay 75 energizes again through test wiper 97 and again closes its locking circuit at armature 90, and at armature 91. again closes the circuit of rotary magnet '79. Rotary magnet 7 9 energizes again and advances the wipers into engagement with the next set of: bank contacts. This alternate operation of stepping relay 75 and rotary magnet 79 continues as described until an idle trunk is reached, which trunk, it will be assumed. is the one shown in the drawings and having the release trunk conductor 99. \Vhcn this occurs, switching relay 76, being no longer from line relay 72 and eonncctsthein to the Wipers S ll and 98 instead, whereupon the line relay oi tliie switch to which the seized. trunk in ds ci'ua'grizes and closes a circuit :tor the associated release relay which pulls up and places ground upon release trunk conductor 99, thereby closing: the usual holdin circuit which becomes ethective upon the Q uent deener ation of the slow acting; relay 42 oi? the trunk circuit TO to hold the established connection.

n the director, the slow acting; pick-up 205 dcencrgizes after the interval for which it is adjusted, responsive to the openino; oil: its locking circuit at ariuatiu'e 23:; oil? stop relay 206, and opens the locking; circuit oil stop relay 206 at armature 233. filtop 1e, lay 206 also is slow acting and does not deencrgize innuediatcly. After an interval, however, stop relay 206 also deenerggiaes and ap'ain connects up pick-up relay 205st arn1atie-e 241-111, and at armature 237 prepares a circuit for stepping relay 204:.

H may be Well to point out at this time that the dead contacts passed over by the wiper 310 after it passes beyond the contact in which the tenth impulse stop conductor 320 terminates, are provided for the purpose of permitting the slow acting relays Q and 5206 to decnergize and again close the pick-up circuit atter conductor 320 iii) is passed and before pick-up conductor is reached. Utherwise, it these contacts Were not provided and it the pick-up position "was passed immediately after the tenth inipulse contact was passed, an unnecessary length ot time Would be consumed follows inc; the termination of the digit 0 and other long; digits While Waiting tor the piclc up position to be reached the second time.

To continue with the description of the operation, as soon as the common pick-up conductor 303 is grounded again, the previously traced circuit "for pick-up relay 205, Fig". 2-3, is again closed, "whereupon pick-up relay 205 energizes andcloscs a locking circuit for itself and the second code digit is transmitted in the same Way as the first. This sccon d code digit is the digit 5. Accordingly, the on d o l. the tii'th interruption in the out union control circuit at armature 230 of ill.- pulse relay 1-, Fig. 3, the second code digit terminated. upon the energization o't stop relay 207 over the following circuit responsive to the grounding of the fifth inupulse stop ci'inductor 816 by the counting switch C: from ground by way of contact Wiper, 310, the fifth lll'll'llllSG stop veonduotor tilt J 82 i the second Wiper 322, the second code dig top conductor 132, Wiper of the sequence switch t5, conductor i220, armature 223 and its resting contact, marginal relay 202, Working contact and arinatin'c 2e28, and stop relay 207 to battery. The sequence sivi :h this automatically advanced in the hcreinhe'liore described manner upon the termination of this d iggit and wiper it?) cmniiccts stop coinluctor l l to the third code d a it stop coiuluctor 133 preparatory to the lI-t iinatiou of the third code digit 2,

lrursponsive to the transmission of the secend code digit- 5, the selector switch seized b .i'n. ot toe first code digit 0, raises its Wiper. to the fi'lth level and selects an idle trunk in the usual manner.

lo. the director, pick-up relay 205 is operated again. upon the ne t grounding of the common piclcup conductor 203 and the trans islon of the third and last code digit as, and, upon the termination of the second interruption in the outgoing control circuit by the impulse relay 20 i, stop relay 2h? ener agiises over the following circuit: from ound by Way oi. contact 329 of the countin switch US, Wiper 310, the third impulse sto p conductor 312, juniper 2157, the third haul; contact 333, the third Wiper $23, the third code digrit stop conductor 133, Wipcr 1.15 of the sequence switch ti, conductor I120, and, as prcvioi'lsly traced, to stop relay 207 and battery. Upon the energization of stop relay 207, this digit is terminated in the usual manner and the Wipers oil the sequence switch S are again advanced.

Responsive to the transmission or the third code digit 2, the selector taken into use responsive to the transmission oi the second code digit 5 raises its Wipers to the second level and selects a trunk ,ine leading to the called office lo the director, the sequence switch S advanced automatically through the Itoiu'th code digit position innnodiately following its advance into the fourth code position as above pointed out. The reason for the autoinatic advance to the tourth code digit position is that only three code di its are necessary in this case to trunk the call to the desired ollice, and it is *rofore, to skip the fourth code digit tion in order to transmit the first subscriber ligit. The vay in Which this position is i tipped will. now be point d out. Upon re'rrr I iiuzerinediate i. stributing frame llllfi, Fig. a, i will be noted that the fourth haul; contact in the set :tcd set instead oit being; cross connected to one of the impulse stop conguniper 336, the second bank y the selector Ed in response to the transniis- O ductors, is cross-connected to the skip conductor 302, which conductor is connected with the booster battery'301, which battery position, a circuit is completed as follows:

from ground by way of the booster battery 301, Fig. 3, skip conductor 302, jumper 3238, contact 334, wiper 324, conductor 134, wiper 115, conductor 120, armature 223 and its resting contact, the marginally adjusted skip relay 202, working contact and arnniture 243, and stop relay 207 to battery. Stop relay 207 which was previously energized in the third position of the sequence switch S remains energized'when the sequence switch advances into the fourth position and the marginally adjusted relay 202 now energizes on account of the increased current occasioned by the introduction'of the booster battery 301 into the circuit in series with the regular exchange battery. Upon energizing, relay 202 closes at armature 226 a circuit over couductor 118 and through thelocal interrupter contacts of stepping magnet 113 for the said stepping magnet 113 in multiple with relays 202 and 207. Accordingly, stepping magnet 113 energizes and interrupts its own circuit, whereupon it deenergizes and advances the wipers 114 and 115 into engagement with the next set of bank contacts. The automatic operation of the sequence switch S ceases now because wiper 115 engages an open contact and relays 202 and 207 fall back. Responsive to wiper 114 coming into engagement with the fifth associated bank contact, change-over relay 201 energizes over the following circuit: from ground by way of relay 201, conductor 117, fifth contact in the bank of wiper 114 and said wiper, local inter- .rupter contacts of the switch S, and stepping magnet 113 to battery. Stepping magnet 113 does not energize at this time, however, on account of the high resistance of relay 201. Upon energizing, relay 201 disconnects wiper 115 from relays 202 and 207 and connects it to ground instead at ar mature 223; disconnects pick-up conductor 119 from pick-up relay 205 at armature 222; prepares a circuit for relays 208 and 209 at armature 224; at armature 221 prepares a. circuit for impulse relay 204 which is independent ot pick-up relay 205; and at armature 225 connects the first subscriber-digit stopv conductor 141 to the corresponding contact in the bank of wiper 115.

In summation of the result of the operation of the change-over relay 201, it may be pointed out that the circuits are now shifted so that the director isready to transmit impulses under the control of the local counting relays 411-420, Fig. 5, rather than under the control of the common counting switch CS, Fig. 4. This change is made at this time, it will be understood, because it is now no longer necessary to operate through the intermediate distributing frame IDF because all 01" the code digits have been transmitted, and the remaining digits to be transmitted are subscriber digits and they are sent out untranslated and may therefore be (runsmitted independent of the common impulsing machine and one right after the other with only the usual trunk hunting time between digits and without waiting for a fixed pickup position to be reached before the next digit is transn'iit-tcd, as is the case with the code digits.

To continue with the operation, it will now be seen that wiper 115 is connected to ground through conductor 120 and through armature 223 and its working contact and that it is standing upon the bank contacts with which the first subscriber digit stop conductor 141 is connected through the working contact and armature 225. Accordingly, in case the subscriber is slow about operating his calling device and has not yet transmitted the first subscriber digit in the desired number, the ground potential applied to the conductor 141 is extended through the wiper of the digit register DR 1 and its normal bank contact to stop relay 200 by way of conductor 256, and the stop relay is held energized to prevent the transon of the first subscriber digit from beginning, and, being slow acting, it does not fall back to permit such transmission to start until a slight interval of time has elapsed after the wiper of the digit register Dit1 has been moved off normal in response to the dialling of the first subscriber digit. This insures that the sending apparatus can not function ahead of the registering apparatus and insures also that the digit register will get a sufiicient start over the sending apparatus to insure that the sending apparatus will not overtake the digit register in case the calling device is somewhat slower in its operation than the sending apparatus.

In the present case we may assume that the first subscriber digit is registered before the transmission of the ollice code is completed and that the calling subscriber continues to manipulate his calling device right along and that the sending apparatus does not catch up until the complete number is dialled. That being the case, the falling back of stop relay 206 is not retarded by the ground potential applied to the first subscriber digit stop conductor 141 by wiper 115 of the sequence switch S and stop relay 206 falls back in the usual manner responsive to the opening of its circuit by pick-up relay 205, whereupon ground is applied to the upper terminal of the impulse relay 204 at armature 237 through armature 221 and its working contact. Accordingly, impulse llll) relay t starts to energize and deenergize under the control of the interrupter 305, Fig. 4, in the usual manner, and, upon the first cnergization of relay 204 a circuit is closed at armature 257 torthe first countingrelay-ctmtrol relay 208 as follows: From groui'id by way of the working contact of armature 224i of change-over relay 201, armature 257 and its WOI'ClIlg contact, relay 208. conductor 252, restingcontact and upper arnuiturc of piclcup relay 4:03, resting contacts and upper armatures of counting relays 1104120, inclusive, and resistance l01 to battery. Upon eneli'gzing over this circuit, relay 208, Fig. 3, closes at armature 240 a locking circuit for itself over conductor which includes the normally closed contacts controlled by the inner lower armature oi pick-up relay 403, pick-up relay 4103, locking conductor 242, resting; contact and armature 230, and armatlnj'c 228 and its working contact. This locking circuit does not become etl cctive at this time, however, owing to the fact that theinitial circuit of relay 208 is still established.

Upon the following deenergization of impulse relay 201, the initial circuit of relay 208 is opened at armature 257, whereupon inch-up relay 103, Fig. 5, energizes in series with the first counting-relay-control relay 208 over the previously traced locking circuit for 203 closes a locking circuit for itselit' and opens its initial circuit at its inner lower armature, whereupon relay 208 dcencrgizes; prepares a circuit for the first counting relay 411 at its lower armature; disconnects battery from conductor 252 associated with relay 208 and connects it. instead to conductor 253 associated with the second counting-relay control relay 209; and at its upper armature places ground upon conductor 251, therebyclosing a circuit for pick-up lt-"ltlfy' 205. Pick-up relay 205 thereupon energizes and removes at armature 232 the shunt from around the annaturc 230 and its resting contact in addition to applying ground to conductor 116 to energize stepping magnet 113 of the sequence switch S" preparatoryto advancing the wipers 114i and 115.

The pick-up step of the counting relay apparatus has now been taken to insure against a short interruption in the outgoing control circuit, and, upon the next energizetier. of impulse relay 201, a circuit closed tor the second conntingrel.ay-control relay 209 which includes conductor 253, working contact and inner upper armature oi: pickup relay 4:03, and thence to battery by way of the resting contacts and armaturcs of relays 411 120, inclusive, and the resistance 101. Relay 209 accordingly energizes and closes at armature 211 a locking circuit for itself which includes conductor 254i, lower armature and working contact of pick-up" relay 403, normally closed contacts controlled by the inner lower armaturcs ot the relay 4:11, andthe groundedconductor This 1ocking circuit is notctlcctirc atthis time, how'- ever, owing to the fact that the initial cir-= cuit is still establisl'led, but, upon the deenergrization oft relay 204, the initial circuit of relay 209 is opened, whereupon the locking circuit becomes elt'ective and the number 1 counting: relay 191.1 energizes in series with relay 209; closes a locking circuit for itself and opens its initial circuit at its inner lower armature, whereupon relay 209 deenergizcs; prepares a circuit for subsequently operating relay 112 over conductor 255 at the next lower armature; shii'ts battery at its upper arnu'iture from conductor of relay 209 back to conductor of relay 208; and at itslower armature connects up stop conductor 256. It is now seen that the first interrupt-ion in the series of interruptions comprising the first subscriber digit has been However, for the purpose of illustrating better the operation of the counting relays,

it will be assumed that the first subscriber digit is the digit 0. Accordingly, the wiper of the digit register DR-1 is in engagement with its last bank contact, which is the bani; contact in whichthe tenth impulse stop conductor 440 terminates, and stop relay 206 is, accordingly, not operated at this time.

since the first subscriber digit is '0, according to the above assumption, the control re lay 208 to whichbattery is now connected through conductor 252 operates upon the next energization of impulse relay 204 and locks itself through the second counting relay 112 which accordingly energizes upon the opening of the initial circuit of relay 208 and connects conductor 256 to the second impulse stop conductor 4132, at the same time preparing the circuit for the operation of relay 209 and the third counting relay 113 upon the next operation of the impulse relay 20 1.

In this manner, the operation of the counting relays continues under the alternate control of the counting-inlay-controlling relays 208 and 209 until the number 0 counting relay 4:20 energizes, at which time ten interruptions have been produced in the outgoing control circuit at armature 230 of relay 204, whereupon conductor 256 is connected with the tenth impulse stop conductor 4t40 and stop relay 200 energizes over the following circuit: from ground by way oi. the working contact and armature 223 of change-over relay 201, conductor 120, wiper 115 of the sequence switch S, working contact and armature 225 oi relay 201, the first sub- A-ccordingly, it the i scriber digit stopconductor 141, wiper of the i digit register DR-1, the last associated bank conta ct,- the tenth impulse stop conductor 440, lower armature and working contact of we the tenth counting relay 420, stop conductor 256, and stop relay 206, Fig. 3, to battery. 'Upon energizing, stop relay206 disconnects impulse relay 204 at armature 237; opens the ,circuit of stepping magnet 113 of the sequence' switch S at armature 236,-whereupon the wipers 114 and 115 are advanccdanother step; also closes a locking circuit for itself at armature 236; and at armature 238 removes ground from conductor 242, thereby opening the locking circuit of pick-up 205 and the locking circuits of relays 403 and 411-420, inclusive. Relays 403 and 411-420,

' inclusive, deenergize immediately but pickup relay 205, as pointed out hereinbefore, being slow acting, maintains its armature attracted for an interval, after which 1t deenergizes and opens the locking circuit of stop relay 206 at armature 233 responsive to which stop relay 206 deenergizes after a short interval and again applies ground to conductor 242 at armature 238, and connects up the impulse relay 204 again at armature 237. 7 I The grounded stop conductor control wiper 415 of the sequence switch S is now standing upon the bank contact in which the second subscriber digit stop conductor 142 terminates, and the wiper of the digit register DR+2 is accordingly grounded and, as

" a result, stop relay 206 is energized as soon as'the counting relay corresponding to the conductorsupon which the wiper of the digit register DR2 is'standing is operated, terminating the second subscriber digit in the usual manner, whereuponthe wipers of the sequence switch S are again advanced and the wiper of the'third digit register DR-3 is grounded over conductor 143 to terminate the third subscriber digit upon the completion of its transmission, whereupon 'the wipers of thesequence switch S are still again advanced and the wiper of the fourth digit register DR4 is grounded over the fourth subscriber digit stop conductor 144. r

Upon the termination of the fourth subscriber digit, the wipers 114 and 115 are again advanced upon the opening of the circuit of stepping magnet 113 at armature 237 of stop relay 206, and wiper 115 applies ground to switching conductor 116, thereby closing a circuit over conductor 65, wiper 61 of the director selector DS, working contact and armature 57, and armature 45 and its working contact, for switching relay 43 of the trunk circuit TC. Switching relay 43 nowenergizes and locks itself to conductor 40 at armature 50, and at armatures 49 and instead to the line conductors of the selector S, at the same time disconnecting the said line conductors from the closed bridge extending through the upper wipers of the director selector DS to the director, thereby leaving the established connection under the direct control of the calling subscriber.

It may be pointed out now that the desired connection has been established and that the calling subscribers bell is being rung in the usual manner.

In the trunk circuit TC, line relay 41 deenergizes responsive to being disconnected by relay 43 and opens the circuit of release relay 42 at armature 44. Accordingly, release relay 42 deenergizes after a slight interval; removes ground from conductor 40 at armature 47, leaving the established connection held up over test wiper 97 of the selector S; opens a further point in the test circuit of the director selector DS at armature .48; and at armature 46 opens the circuit of switching relay 52 of the director selector'DS, whereupon relay 52 decnergizcs, freeing the director.

In the director, ground is removed from release trunk conductor 64 when the director is freed, as above pointed out, thereby opening the circuit of the holding relay 203 and gizes; grounds at armatures 227 and 227' all the contacts in the bank of the restoring wiper 114 of the sequence switch S with the exception of the normal contact, whereupon the upper winding of relay- 201 is short circuited and the said relay 201 deenergizes. Also, a circuit is closed through the last contact in the bank of wiper 114 and the said wiper for stepping magnet 113 which operates to automatically advance the wipers 114 and 115 to their normal position. As a further result of the deenergization of the holding relay 203, it applies ground at armature 229 to the release conductor 117, thereby closing a circuit through off normal contacts 328 for release magnet 327 of the oflice register OR, whereupon release magnet 327 energizes and the wipers of the oflice register are restored to normal position in the usual manner and the circuit of release magnet 327 is opened upon the opening of off normal contacts 328 when the switch shaft reaches its normal position.

The sequence switch S and the digit registers DR1DR4, inclusive, are restored to normal position in a similar manner. The director is now in a normal condition and may be used in handling another call.

lVhen the called subscriber responds to the ringing of his bell by removing his receiver, the flow of current in the calling subscribers loop is reversed in the usual manner responsive to the cnergization of the back bridge relay of the connector. When this occurs, the current how is, of course, reversed in the upper winding of the electropolarized relay 71 and relay 71 energizes for the first time; short circuits the resist ance Selbetween conductor l0 and conductor 37 at armature 85; and, just before its armature proper (not shown) has reached the limit of its stroke, short circuits its upper winding and the resistance 83 at armature '86 so is to provide a better talking circuit. The construction and adjustment of this relay is such that although the lower winding alone is unable to operate the armature proper of the relay, it is able to maintain the armature proper oi the relay attracted after it has once been pulled up. Responsive to the short circuiting of the resistance 84, the marginally adjusted meter M is operated due to the increased current flow through the winding of the magnet 17, and registers the completed connection.

The calling and called subscribers may now, converse with each other in the'usual manner and when the conversation is completed they both replace their receivers. Nhen the receiver is replaced at the called substation, the current flow in the calling subscribers loop is reversed back to normal but the electro-polarized relayll does not now deenergize because, owing to the fact that its upper winding isshort circuited at armature 86, it is removed from the control of the current flow in the calling loop.

When the receiver is replaced at the substation A, the ground potential is shortly removed from release trunk conductor 99 of the trunk seized by the selector S in the usual manner, whereupon switching relay 76 of the selector S, electro-polarized relay 7:1, and switching relay 41-3 of the trunk circuit TC deenergize. Also, the circuit of the slow actingline relay 16 of the line switch LS is opened and it deenergizes shortly and opens the circuit of relay 15 which deenergizes. The deenergization of switching relay 76 of the selector results in the usual release magnet circuit being closed at armature 94 which includes armatures 87 and 88 and oil normal contacts 78, whereupon release magnet 77 energizes and the selector is restored to normal position in the usual manner.

Regarding the utility of the small condenser 39, which is connected between the line relay 37 and one limb of the outgoing control circuit, coming from the director through the upper wiper of the director select-or DS, it maybe pointed out that this condenser is of a very small capacity and is just high enough to enable the calling subscriber to hear the interruptions being produced by the director as it operates to complete the establishment of the connection after the calling subscriber has completed the dialling of the number and is waiting for the ringing of the calledsubscribed to begin. This has the effect of making a prolonged wait, in case there is one, such, for example, as on calls to having long oflice codes, seem less tedious,

and has the further utility of informing the calling subscribed that the exchange equipment is operating.

Referring now particularly to Fig. 1, it may bereadily seen that when the line of substation A is called, switching relay 15 is pulled up upon the application of the ground potential to private nonnal conductor 1'3 and disconnects the line conductors 11 and 12 from line relay l6 and ground, respectively, at armatures l8 and 22, but these conductors are not extended through to the line wipers 28 and 31 because line relay 1 6 is not at this time energized, as is the case when a call is originated on the line of substation A, a

As hereinbetore pointed out, the line switch LS is provided with two test wipers 29 and 30. The reason for this will now be fully explained. Viper 29., in addition to being used as a test wiper, is used also as aholding wiper and current is supplied to this wiper l'romconductor 37 for holding up line relay 16 on an outgoing call, as hereinbefore pointed out. Now, if test wiper 29 alone was provided for the line switch LS, i. e, if test wiper 30 and the associated connections were omitted,the line switch LS would stilloperate and would be largely successful. However, one or two undesirable operating features would be present. In the first place, it is always desirable to make a seized trunk busy immediately upon seizure. This would not be done if test wiper 30 were omitted because ground is not suppliedto releasetrunkconductor 37 from conductor 40 until the line and release relays 41 and 42 of the trunk circuit TC have pulled up one after the other in response to the seizure of the associated trunk. Furthermore, the release trunk conductor 37 could not then be used as a meter operating conductor in the manner shown in the draw ings, because it is impractical to depend upon ground supplied through the resistance 84 to operate the stepping magnet 14 of the line switch LS and the conductors 37 and 40 would have to be joined directly together.

The second undesirable operating feature presentin case only the test wiper 29 is provided, is that the trunk last seized by the line switch LS would be rendered idle to the 7 other line switches immediatelyupon the re- Considering now on the other hand the operation of the line switch LS, 1n case the test wiper 30 is provided with wiper 29 acti'ng'only in its capacity as a lld111g and ,meter operating wiper, i.'e., with the back contact of armature and the associated conduct-or removed, the operation of the line 7 switch is obviously perfectas regards seizing a trunk because the seized trunk is made 'busyimniediately upon the operation of armature 21 of relay 15, and the seized trunk is not rendered idle upon the release of the connection until line relay 16 deenergizes and opens the'circuit of switching relay 15 at armature 25, whereupon the ground but, with test wiper 29 wired up as shown,

release trunk conductor 37 may be grounded at will at the. selector S by an attendant,

who, for this purpose, may insert any piece of'conducting material of the proper size and shape between the springs of the ack J.

A careful study of the drawings will reveal that, with the line switch LS operated 'on'an outgoing call, and with the electro- V polarizedrelay 71 not yet operated, the full 1 ground potential issupplied to the marginal meter M whenever another searching line a switch "passes over-the multiple terminals of the-trunk'extending to the trunk circuit TC, because of the fact that the test wipers corresponding to the test wipers'29 and of the line switch LS are connected together and the ground potential, therefore, which is on conductor 34 is extended through the two test wipers in series of the searching switch to conductor 33, and thence to the magnet 17 of the meter M through test wiper 29 and armatures 14 and 19. The meter M is not operated under such a condition, however, owingto the fact that the time during which the above described circuit is established is very short owing to the high speed at which the line switches travel. Furthermore, due to the mechanical construction of a meter such as M, a meter does not operate nearly so quickly as a stepping magnet and the searching line switch has passed beyond before the meter can get start-ed to pull up.

lVhatis claimed is 1.'In' a two-motion automatic switch, a primary operating magnet, a slow acting change-over relay, means for sending impulses'to said operating magnet and said chan e-over rela simultaneousl and contact-son said operating magnet for disconnecting said change-over relay from the impulse circuit.

2. In a call director, an oflice register, multiple connections between the bank contacts of said ofiice register and the bank contacts leading to each of said directors, and means for sending impulses over said impulse conductors and for advancing sald counting switch in synchronism with said impulses.

' 3. In a relay counting device, a series of counting relays and two priming relays, a circuit for transmitting impulses to said priming relays, circuit connections for energizing the first primin Y relay upon the receipt of the first impulse, contacts on said first priming'relay for closing a locking circuit for itself including the first of said counting relays whereby the first counting relay is energized in series with the first priming relay when the initial circuit of the first priming relay is opened when the first impulse subsides, contacts on the first counting relay for disconnecting the first priming relay and for connecting up the second priming relay. contacts on the second priming relay corresponding to the said contacts on the first priming relay but connected to the second counting relay, contacts on the second counting relay for disconnecting the second priming relay and for connecting up the first priming relay, contacts on the remaining odd numbered relays corresponding to said contacts on said first counting relay, and contacts on the remaining even numbered counting relays corresponding to the said contacts on said second counting relay.

4. In a telephone system, a pluralit of directors, a common distributing frame, an oflice register in each director having its bank connected to one side of said frame in multiple with the banks of the ofiice registers in the other directors, and a counting switch having its bank connected to the other side of said frame.

5. In a telephone system, a plurality of directors, a common distributing frame, an office register in each director having its bank connected to one side of. said frame in multiple with the banks of the ofiice registers in the other directors, a counting device having a plurality of digit contacts, and connections from said contacts to the other side of said frame.

6. In a telephone system, a plurality of directors, each including a register and a sender, and a common counting device for controlling the sender in each director by means of the associated register.

7. In a telephone system, a plurality of directors, each including a register and a sender, and a step by step counting switch common to said directors for cont-rolling said senders by means of the associated registers.

8. In a telephone system, a plurality of directors, each including a register and a sender, a step by step counting switchcommon to said directors for controlling said senders by means olithe associated registers, and means for operating the said senders in synclu'onism withsaid counting switch.

9. In a telephone system, a plurality of directors, each including a register and a sender, a common counting device for con trolling the sender in each director by means of the associated register, and a commondistrihuting counting registers. i

10. In a telephone system, aplurality of directors. each including a register and a sender, a step by step counting switch common to said directors for controlling said device and the banks of said senders by means of the associated registers,

and means for preventing the starting of any sender except when said counting switch in a particular position.

11. In a 'telephoneisystem, a plurality of directors, each including a register and a sender, a common. counting device for controlling the sender in each director byjmeans of the associated register, and means for starting each sender at'a particular point in the operation ofsaid counting device,

12. In atelephone system, a plurality of directors, each including a register and a sender, a common counting device for controlling the sender in each director by means of the associated register, and means for starting a sender co-ordinatcd as to time with the operation of the counting device so that the sender starts transmitting impulses when the counting device starts counting. 13. In a telephone system, a plurality oi? directors, an impulse transmitting relay in each director for: producing series of 1mpulses, a stop relay in each director for terurinating theimpulse series, and a common counting device for controlling all said step relays.

14. In a telephone system, a plurality. of directors, an'impulse transmitting relay in each director for producing series of impulses, a stop relay in each director for terminating the impulse series, an individual interrupter for operating each ti-ans mitting relay, and a common. counting device for controlling all said step relays.

15. In a telephone system, a plurality of directors, an impulse transmitting relay in each director for producing series of impulses, a stop relay in each director for terminating the impulse series, a common device including a plurality oi synchronous interrupter circuits over whicha plurality of said interrupter-s control. said plurality of transmitting relays, a common counting switch for controlling said step relays, and a circuit over which another of said inter rupters controls said countingswitch.

iranie intervenin between said 16. In a telephone system, a plurality of directors, an impulse transmitting relay in each director for producing series of im pulses, a stop relay in each director for terminating the impulse series, a common counting device, and means including a register in each director for placing the associated stop relay under the control of said counting device.

17. In a telephone system, a plurality of directors, an impulse transmitting relay in each director for producing series of impulses, a stop relay in each director for ter minating the impulse series, a a common counting device, a register in each director having a plurality of wipers, each wiper for preparing a circuit betweenthe associ ated stop relay and said counting device, and a sequence switch in each director for connecting the associated stop relay in circuit with the several wipers of the associated. register successively.

18. In a telephone system, a plurality of directors, each including a sender, anofiice register, and digit registers, a counting do vice common to said directors for controlling said sender by meansolf said ofiice register, and a counting device individual to each director for controlling the. sender in the associated director by means of the associated digit registers. y a

19. .In a telephone system, a plurality of directors, each including a sender, an. ofiice register, and digit registers, a counting device common to said directors for controlling said sender by means of said oliice register, a counting device individual to each. director for controlling the sender in the as sociated director by means of the associated digit registers, and means automatically etliective upon the transmission oil the last ollice digit by said-sender for shifting the control of the same from the common counting device to the said individual counting device.

20. Ina director, a register for selecting an oflice code, a sender, means including a sequence switch having a plurality of posi tions for causing said senderto transmit the digits'ol a selected code, means includinga' stop conductor and a stop relay for terminating each digit of a code being transnntted, and a marginal relay mcluded 111 said stop conductor for automatically advancing said sequence switch through the surplus po} sitions whenever a code is transmitted having less than the maximum number of digits. 1

21. In a telephone system, a director, an ollice rc 'isterhaving a plurality oi wipers,

a distributing frame having terminals on one side connected. in multiple with the bank of said register, digit bus bars on the other 31(1001E said frame and a battery bus bar,

jumpers connecting certain of said termin'als to digit bus bars and certain other terminals to said battery bus bar, a sender in said director, means including a sequence switch effective after the said register has been set to place the saidv sender under the control of said wipers successively, and meanstor automatically advancing the seq'uence switch to skip wipers whenever the sender is associated with a wiper resting on "a bank contact associated with a terminal which-is connected to said battery bus bar.

. 22. In combination, an impulse responding device -.including an operating magnet arran ed to operate said device, a slow act- 'ing clange-over relay, means for sending impulses to said magnet and to-said relay, and contacts on said magnet for terminating 'each impulse to said relay. I

23. Ina step-by-step automatic switch, a driving magnet for operating said switch, a slow acting-changeover relay, means for transmitting impulses ol variable length to saidrelay and to said magnet, and means controlled by said magnet for altering the impulses delivered to said relay so that they are all of substantially the same length.

24. Ina director, a register for selecting an ofiicecode, a sender, means including a sequence switch having a plurality of positions for causing said sender to transn'iit the digits of a selected code, means including a stop conductor andastop relay for terminating each digit of the code being transmitted, a'relay'ineluded in said stop conductor unresponsive to the control exercised over said stopconductor to operate said step relay, and means for operating thesecond named relay over said stop conductor to automatically advance-said sequence switch through the surplus position'whenever a code is t 'ansmitted having-less than the maxin'ium nulnberof digits. v

V 25.1 In a telephone system employing seri' ally related switches for setting up connec- :tions, a plurality of register controllers for controlling said switches, an impulse send- ,ingimaehine common, to said register c011- trollers and having a plurality of control leads corresponding, respectively, to the oo difl'erent impulse series that may be transmittedbysaid' register senders, means tor operating the registering portion of any one of said register" senders to select any one of said-leads, and means including said sending 'machine and said controller for transmitting a series of impulses corresponding tothe lead selected- 26. In a telephone system, automatic switches,"register controllers, a sending device having associated therewith primary control conductors corresponding, respectively, to impulse series of different lengths, a plurality of secondary control conductors multipled throughout all said register controllers, a' distributing frame at which any 7 secondary conductor can be connected with any primary conductor, and means for operating a train of said switches under the joint control of any one of said re ister controllers and said sendin device, t c said control being exercised t rough one of said second ary conductors throu h the connection made at said distributing 'rame with one of the primary conductors.

27. In an automatic telephone system employing a plurality of register controllers for controllin the automatic switches, an impulse sen ing device common to all said register controllers and having associated therewith ten primary di it conductors for determining the length 0 impulse series, a greater plurality of secondary digit conductors multipled to all of said register controllers, and a distributing frame at which any primary digit conductor can be connected to any conductor in said multiple.

28. In a director system in which impulse series are transmitted under the 'oint control of any one of a plurality o registers and a single sender, a distributing frame whereat the value of the digit transmitted in accordance with a given set position of any register may be assigned at will.

29. In a telephone system, automatic switches, register controllers, a sending de vice common to said register controllers, and means for operating a train of said switches under the joint control of said sending device and any one of said register controllers, the extent of the directed movement of each switch being governed by the common device.

30. In a telephone system, automatic switches, register controllers, a sending device common to said register controllers, and means for operating a plurality of trains of Said switches contemporaneously, each train of switches being operated under the joint directive control of said sending device cooperating in each case with a different one of said controllers.

31. In a telephone system, a plurality of directors, each including a. register and a sender, and a progressively movable device common to all said directors, and means whereby sald device cooperates with any operated register to cause the associated sender to transmit a series of impulses whose value is determined jointly by the register in question and the said device.

32. In a telephone system, a plurality of directors, a register in each director, an impulse circuit outgoing from each director, a progressively movable device common to all said directors, and means including a common distributing frame for causing said device to cooperate with any operated register to transmit a predetermined series of impulses over said circuit.

33. In a telephone system, a. plurality of erating saidsenders, means for placing any sender under control of said device, and means common to all the senders and adapted to cooperate With the register associated with any operating sender to stop such sender.

.35. In a telephone system, a plurality of controllers, each including a register and a sender, and a common counting device for controlling the sender'in each controller by means of the associated register While such register remains stationary in a set posir tion.

36. In a telephone system, a plurality of controllers, each including a register and a sender, means for setting a register in any one of said controllers, and a counting dcvice common to all said controllers for con trolling any sender by means of the associated register and in accordance with the position in which it has been set.

37. In a register sender system, a plurality of register senders, a plurality of digit conductors multipled into a register in each of said register senders each conductor corresponding to a different digit, means for setting any register onto any conductor to predetermine a digit, and means for operating the sending portion of said register senders simultaneously each in accordance With the setting of the associated register and without interference between the different senders.

38. In a register sender system wherein a sender is arranged to transmit a series of impulses of a value directly controlled through the associated register, a plurality of digit conductors each corresponding to a different digit and multipled into a plurality of registers, each of said registers being in a different register sender, means tor operating a plurality of senders simultaneously so that each sender is' controlled over said multiple connections in accordance with the set position of itsassociatcd register to transmit a series of impulses of a value determined by the setting'of the associated register and without interference from any other register sender.

39. In a register sender for use in a multioiiice telephone system, an oflice register having a plurality of Wipers, a stop relay for stopping successive sending op erations in accordance with the setting of said oiiice register, and a sequence switch for connecting said stop relay to the Wipers or said office register successively.

4L0. In-a register sender a plurality of registering devices, a stop relay for termmating the successive sending operations,

said stop relay being connected at onetermina-l to a source of current, and means for coimectingthe other terminalot the stop relay to. said registering devices successively so that the several operations are terminated underthe control of the several registering devices respectively.

il; in a register sender forusein a tele phonesystein to send a plurality of digits,

a plurality of digit conductors, a counting device arranged to apply potentials to said digit. conductors successively, means for bringing said registering devices into engagement With certain ones of said digit conductors to predetermine the combination of digits to be transmitted, means for start-- ing the sending operation to transmit the digits, a stop relay for terminating each of the digits arranged to respond to the application of potential by said counting device, and means for connecting said stop relay to the first oi? said registering devices and for shifting it into connection with the remaining r v 'stcring devices successively as the respective digits are transmitted.

42. In a register sender for use in a telephone system i and arranged to transmit a )l,urality of digits, a plurality of registering devices, means for transmitting one of said digits and for controlling the value thereof in accordance with the setting of one of said registering devices responsive to potential applied to such device through the stop relay, and means for controlling the value of the remaining d'gts by applying potential successively to the remaining ones of said registering devices over a circuit path independent of said stop relay. 43. In a register sender for retransmitting a plurality of digits in accordance With the setting of registering apparatus, two stop relays, means for terminating one of the transmitted digits by operating one stop relay and means for terminating a plurality of other digits by operating the other stop relay While the first stop relay maintained ncnopcrated.

It. In a register sender for use in a telephone system to transmit a plurality of digits in accordance with the setting of a plurality of registering devices, two stop relays, means for t'ern'iinating one digit of the plurality by operating both of said stop relays, and means for terminating another of said digits by operating only one of said stop relays.

4-5. In a sending device, a stop relay, an 

